XSol Diagnostic System

Welcome to the XSol Diagnostic System

This system provides interactive diagnostic tests with proper sequence navigation based on the decoded .seq file logic.

Start Diagnostic Sequence

or choose a specific test below:

APPLIANCE APPEARS SATISFACTORY.

Next: nff

DHW FLOW RATE

Next: &803, f1424

DHW FAN RUNS

SELECTOR SWITCH TO D

Next: &6, ?35, ?37, ?1010

DHW BURNER IGNITION

ATTACH U-GAUGE TO GA

Next: &7, ?61, ?63, ?65, ?1200

DHW BURNER ESTABLISHED (HIGH FLAME)

ATTACH U-GAUGE TO GA

Next: &9, ?94, ?96, ?98, ?1248

DHW OPERATION

SELECTOR SWITCH TO D

Next: &10, ?137, ?139, ?141

DHW MODULATION

SET FLOW RATE AT TAP

Next: &472, f906

CH OPERATION

SELECTOR SWITCH TO D

Next: &13, ?163, ?165, ?167, ?336

SYSTEM PRESSURE RISE

SELECTOR SWITCH TO D

Next: &14, !f193

CH MODULATION

ATTACH A U-GAUGE TO

Next: &15, f909

RE-IGNITION DELAY

SELECTOR SWITCH TO D

Next: &16, ?1549, ?1551

PUMP OVERRUNS

SELECTOR SWITCH TO D

Next: &nff, !f196

CH IGNITION

ATTACH U-GAUGE TO GA

Next: &12, ?1524, ?1526

FAULT CODES

Next: &3, !f611

TYPE OF DIAGNOSTIC PROCEDURE

PLEASE SELECT FROM O

Next: &605, !f609

OBSERVATION MAINS LED ILLUMINATED

ENSURE THE SELECTOR SWITCH IS IN HEATING AND HOT WATER MODE

Next: &818, ?804, ?806

DHW PUMP RUNS

SELECTOR SWITCH TO DHW POSITION
DHW TEMPERATURE SELECTOR TO MAXIMUM
ENSURE NO DEMANDS

Next: &5, ?819, ?821, ?823

PUMP FAULT

OUTSIDE MODEL

Next: &nff, f913

OVERHEAT FAULT

OUTSIDE MODEL

Next: &nff, f960

THERMISTOR FAULT

OUTSIDE MODEL

Next: &nff, f1075

HEADER FOR FUSE INVESTIGATION

INTENTIONALLY BLANK, HEADER FOR FUSE INVESTIGATION

Next: &nff, f1499

SETTING THE MULTIMETER TO DIODE TEST

THE IMAGES BELOW SHO

Next: &nff, !f1515

DHW BURNER ESTABLISHED

ELECTRODE - IGNITION

Next: End

DHW FAN RUNS

PIPE - PRESSURE SWITCH - NEGATIVE / POSITIVE

Next: End

DHW FAN RUNS

VENTURI

Next: End

AIR FLOW PROBLEM

VENTURI

Next: End

AIR FLOW PROBLEM

FLUE

Next: End

AIR FLOW PROBLEM

PCB

Next: End

FAULT CODE THERMISTOR

SENSOR - TEMPERATURE

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

CABLE - SELECTOR SWITCH / PUMP

Next: End

DHW BURNER ESTABLISHED MODULATING SOLENOID

GAS VALVE

Next: End

OVERHEAT INVESTIGATION

SYSTEM PRESSURE

Next: End

OVERHEAT INVESTIGATION

PUMP

Next: End

OVERHEAT INVESTIGATION

SENSOR - TEMPERATURE

Next: End

GAS VALVE TOOK PCB OUT

PCB AND GAS VALVE

Next: End

BOILER AND RADS ONLY GET WARM

TAP - ISOLATION - FLOW / RETURN

Next: End

RESTRICTED OR BLOCKED 2

FILTER RETURN

Next: End

BOILER TO TEMP RADS COOL

TAP - ISOLATION - FLOW / RETURN

Next: End

RESTRICTED OR BLOCKED 3

FILTER RETURN

Next: End

OVERHEAT

TAP - ISOLATION - FLOW / RETURN

Next: End

AIR FLOW NO SPARK

HEAT EXCHANGER - PRIMARY

Next: End

LOW OR FLUCTUATING VOLTAGE TO FAN

PCB

Next: End

DHW BURNER IGNITION DROPPING OUT

SWITCH - PRESSURE

Next: End

DHW BURNER IGNITION DROPPING OUT

PIPE - PRESSURE SWITCH - NEGATIVE / POSITIVE

Next: End

AIR FLOW NO SPARK DROPPING OUT

HEAT EXCHANGER - PRIMARY

Next: End

DHW BURNER IGNITION DROPPING OUT

FLUE

Next: End

AIR FLOW PROBLEM FAULT CODE

HEAT EXCHANGER - PRIMARY

Next: End

AIR FLOW PROBLEM FAULT CODE

PCB

Next: End

LOCKING OUT

TRAP - CONDENSATE

Next: End

FAN DOES NOT RUN

SYSTEM PRESSURE

Next: End

PUMP PROVING SWITCH

TAP - ISOLATION - FLOW / RETURN

Next: End

FAN DOES NOT RUN

PUMP

Next: End

RESTRICTED OR BLOCKED

FILTER RETURN

Next: End

RESTRICTED STOPPING FLOW SWITCH MAKING

PIPE ASSEMBLY - BYPASS

Next: End

FAN DOES NOT RUN

SENSOR - TEMPERATURE

Next: End

LOCK OUT RESET

SWITCH SELECTOR

Next: End

FAN DOES NOT RUN

MICROSWITCH ASSEMBLY - FLOW VALVE

Next: End

FAULT CODE PUMP

SYSTEM PRESSURE

Next: End

PUMP PROVING 2

TAP - ISOLATION - FLOW / RETURN

Next: End

FAULT CODE PUMPFAN DOES NOT RUN

PUMP

Next: End

RESTRICTED OR BLOCKED 4

FILTER RETURN

Next: End

RESTRICTED STOPPING FLOW SWITCH MAKING FAULT CODE

PIPE ASSEMBLY - BYPASS

Next: End

FAULT CODE PUMP

MICROSWITCH ASSEMBLY - FLOW VALVE

Next: End

POOR SUPPLY

TAP - ISOLATION - DHW INLET

Next: End

DHW FLOW RATE

FILTER - DHW INLET

Next: End

DHW FLOW RATE

DHW FLOW RESTRICTOR/FILTER/VENTURI

Next: End

LOW

WATER SUPPLY PRESSURE

Next: End

RESTRICTED OR BLOCKED

SECONDARY HEAT EXCHANGER

Next: End

OVERHEAT INVESTIGATION

GAS VALVE

Next: End

RESTRICTED OR BLOCKED 5

FILTER RETURN

Next: End

OVERHEATING

SECONDARY HEAT EXCHANGER

Next: End

NOP OPENING UP TO RADS FULLY

HYDRAULIC OUTLET ASSEMBLY

Next: End

MAINS LED FLASHING

FAN

Next: End

EARTH LEAKAGE

CABLE - GAS VALVE / IGNITER

Next: End

EARTH LEAKAGE 2

CABLE - GAS VALVE / IGNITER

Next: End

EARTH LEAKAGE 3

CABLE - GAS VALVE / IGNITER

Next: End

EARTH LEAKAGE 4

CABLE - GAS VALVE / IGNITER

Next: End

BLOWING FUSE

PUMP

Next: End

BLOWING FUSE

FAN

Next: End

BLOWING FUSE

GAS VALVE

Next: End

BLOWING FUSE

CABLE - GAS VALVE / IGNITER

Next: End

BLOWING FUSE 2

CABLE - GAS VALVE / IGNITER

Next: End

BLANK FOR SETTING METER TO DIODE TEST

Z BLANK

Next: End

BLOWN

FUSE MAINS

Next: End

DHW PUMP RUNS

FUSE 2 AMP

Next: End

CH IGNITION

SWITCH SELECTOR

Next: End

CH IGNITION NO IGNITION TIMER LINK

PCB

Next: End

CH IGNITION

TIMER LINK (NO CLOCK)

Next: End

NO CLOCK IN VOLTS

PCB

Next: End

NO IGNITION

TIMER (CLOCK)

Next: End

NOT RAMPING UP FOR CH

SENSOR - TEMPERATURE

Next: End

NOT RAMPING UP FOR CH

PCB-CONTROL KNOB ALIGNMENT

Next: End

FAULT CODE 80

SWITCH SELECTOR

Next: End

OVERHEAT INVESTIGATION80 DEG OVERHEAT

SYSTEM PRESSURE

Next: End

OVERHEAT INVESTIGATION80 DEG OVERHEAT

TAP - ISOLATION - FLOW / RETURN

Next: End

OVERHEAT INVESTIGATION80 DEG OVERHEAT

PUMP

Next: End

FAULT CODE 80

SECONDARY HEAT EXCHANGER

Next: End

OVERHEAT INVESTIGATION80 DEG OVERHEAT

GAS VALVE

Next: End

RESTRICTED OR BLOCKED 580 DEG OVERHEAT

FILTER RETURN

Next: End

FAULT CODE 60

PCB

Next: End

DHW IGNITION

GAS VALVE COMPENSATION TUBE

Next: End

DHW IGNITION

GAS INLET PRESSURE

Next: End

CH IGNITION

GAS VALVE COMPENSATION TUBE

Next: End

OVERHEAT IVESTIGATION

THERMOSTAT - OVERHEAT FLUE

Next: End

ELECTRICAL SAFETY CHECKS

ELECTRICAL SAFETY CHECKS

Next: End

EARTH LEAKAGE 5

CABLE - GAS VALVE / IGNITER

Next: End

BURNER PRESSURE EXC

GAS VALVE COMPENSATION TUBE

Next: End

SPARK NO GAS

GAS VALVE COMPENSATION TUBE

Next: End

FAN RUNS THEN STOPS

THERMOSTAT - OVERHEAT FLUE

Next: End

FAULT CODE OVERHEAT

THERMOSTAT - OVERHEAT FLUE

Next: End

PUMP PROVING SWITCH SECTION

CABLE - TEMP / PRESSURE THERMOSTAT

Next: End

PUMP PROVING SWITCH SECTION 2

CABLE - TEMP / PRESSURE THERMOSTAT

Next: End

CH NOISY DHW OK

PUMP

Next: End

CH NOISY DHW OK

PIPE ASSEMBLY - BYPASS

Next: End

SYSTEM PRESSURE VESSEL

EXPANSION VESSEL

Next: End

PUMP OVERRUNS

PCB

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

PUMP

Next: End

HIGH FLAME NO OUTPUT FROM IGNITION BOARD

PCB

Next: End

DHW FAN RUNS

THERMOSTAT - LIMIT

Next: End

FLAME SENSE POSITION

FLAME SENSE POSITION

Next: End

DHW BURNER ESTABLISHED

LEAD - SENSING ELECTRODE

Next: End

AUTO FROST

SENSOR - TEMPERATURE

Next: End

DHW BURNER ESTABLISHED

SENSOR - TEMPERATURE

Next: End

PROC

DUMMY

Next: End

FLT CODES

DUMMY

Next: End

CH OPERATION

SENSOR - TEMPERATURE

Next: End

BOILER AND RADIATORS PROVIDE INSUFFICIENT HEAT

PCB

Next: End

BOILER AND RADIATORS PROVIDE INSUFFICIENT HEAT

PUMP

Next: End

BURNER IGNITES BUT BAFFLES OUT

GAS INLET PRESSURE

Next: End

BAFFELING OUT

TRAP - CONDENSATE

Next: End

DHW BURNER ESTABLISHED

HEAT EXCHANGER - PRIMARY

Next: End

BAFFLES OUT

SECONDARY HEAT EXCHANGER

Next: End

IGNITES BAFFLES OUT

FLUE

Next: End

DHW COLD RADS COLD

SENSOR - TEMPERATURE

Next: End

PCB-CONTROL KNOB ALIGNMENT

PCB-CONTROL KNOB ALIGNMENT

Next: End

DHW OPERATION

MANIFOLD -BURNER

Next: End

DHW OPERATION

PIPE ASSEMBLY - BYPASS

Next: End

CH IGNITION2

SWITCH SELECTOR

Next: End

CH IGNITION NO IGNITION TIMER LINK2

PCB

Next: End

CH IGNITION2

TIMER LINK (NO CLOCK)

Next: End

NO CLOCK IN VOLTS2

PCB

Next: End

NO IGNITION2

TIMER (CLOCK)

Next: End

PUMP RUNS NO DEMAND

CABLE - SELECTOR SWITCH / PUMP

Next: End

DHW PUMP RUNS

SERVICE KIT - DIAPHRAGM - COMBI - DHW

Next: End

DHW PUMP RUNS

PIPE - PRESSURE - NEGATIVE / POSITIVE

Next: End

DHW VENTURI

HYDRAULIC VENTURI ASSEMBLY

Next: End

NO DEMAND REC

CABLE - SELECTOR SWITCH / PUMP

Next: End

DHW PUMP RUNS

SWITCH SELECTOR

Next: End

DHW BURNER IGNITION

SWITCH - PRESSURE

Next: End

DHW BURNER IGNITION NO SPARKING APS WIRES

CABLE - FAN / PRESSURE SWITCH

Next: End

NO SPARK

PCB

Next: End

OVERHEAT THERMOSTAT RESISTANCE

LEAD - IGNITION ELECTRODE

Next: End

NO SPARK

SPARK GAP

Next: End

DHW BURNER IGNITION

PIPE - PRESSURE SWITCH - NEGATIVE / POSITIVE

Next: End

DHW BURNER IGNITION

FLUE

Next: End

DHW BURNER IGNITION

GAS INLET PRESSURE

Next: End

DHW MODULATION

SENSOR - TEMPERATURE

Next: End

CH MODULATION

SENSOR - TEMPERATURE

Next: End

FAULT CODE PUMP NO PUMP

PCB

Next: End

SPARK GAS PRESENT NO IGNITION

SPARK GAP

Next: End

FAULT CODE OVERHEAT

THERMOSTAT - LIMIT

Next: End

FAULT CODE 50 NOT PROVING IN N/O

SWITCH - PRESSURE

Next: End

FAULT CODE FAN SPARKING APS WIRES OPEN CIRCUIT

CABLE - FAN / PRESSURE SWITCH

Next: End

FAULT CODE FAN

PIPE - PRESSURE SWITCH - NEGATIVE / POSITIVE

Next: End

FAULT CODE FAN

FLUE

Next: End

CH MODULATION

PCB

Next: End

DHW MODULATION

PCB

Next: End

DHW FAN RUNS

FAN

Next: End

DHW FAN RUNS APS WIRES SHORTED

CABLE - FAN / PRESSURE SWITCH

Next: End

DHW FAN RUNS

SWITCH - PRESSURE

Next: End

FAN RUNS 3 TIMES

PCB

Next: End

FAULT CODE FAN - FAN RUNS 3 TIMES

PCB

Next: End

AIR FLOW PROBLEM

SWITCH - PRESSURE

Next: End

AIR FLOW PROBLEM

FAN

Next: End

AIR FLOW PROBLEM

CABLE - FAN / PRESSURE SWITCH

Next: End

FAULT CODE FAN - APS WIRES SHORTED

CABLE - FAN / PRESSURE SWITCH

Next: End

FAULT CODE THERMISTOR

CABLE - TEMP / PRESSURE THERMOSTAT

Next: End

NO IGNITION NO OUTPUT FROM IGNITION BOARD

PCB

Next: End

BOILER AND RADIATORS PROVIDE INSUFFICIENT HEAT

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

Next: End

NO POWER TO FAN FULL MODEL

CABLE - FAN / PRESSURE SWITCH

Next: End

DHW BURNER IGNITION DROPPING OUT

FAN

Next: End

DHW BURNER IGNITION DROPPING OUT

VENTURI

Next: End

NO SPARK DROPPING OUT

SECONDARY HEAT EXCHANGER

Next: End

NO SPARKING DROPPING OUT

WASHER 58 DIA - FRONT BEND

Next: End

NO SPARKING DROPPING OUT

CLAMP - BEND - FAN OUTLET

Next: End

DHW BURNER ESTABLISHED

PCB

Next: End

DHW FAN RUNS

SERVICE KIT - DIAPHRAGM - COMBI - PRIMARY

Next: End

DHW FAN RUNS

HYDRAULIC OUTLET ASSEMBLY (CH SPINDLE)

Next: End

FAN DOES NOT RUN

HYDRAULIC OUTLET ASSEMBLY

Next: End

FAN DOES NOT RUN

HEAT EXCHANGER - PRIMARY

Next: End

SENSOR - FAN NOT RUNNING

CABLE - TEMP / PRESSURE THERMOSTAT

Next: End

FAULT CODE PUMP

SERVICE KIT - DIAPHRAGM - COMBI - PRIMARY

Next: End

FAULT CODE PUMP

HYDRAULIC OUTLET ASSEMBLY (CH SPINDLE)

Next: End

FAULT CODE PUMP

HYDRAULIC OUTLET ASSEMBLY

Next: End

FAULT CODE PUMP

HEAT EXCHANGER - PRIMARY

Next: End

DHW FLOW RATE

HEAT EXCHANGER - DHW - 10 PLATES

Next: End

DHW TEMPERATURE LOW RADIATORS COLD

HEAT EXCHANGER - DHW - 10 PLATES

Next: End

RESTRICTED OR BLOCKED

HEAT EXCHANGER - PRIMARY

Next: End

OVERHEAT INVESTIGATION

PCB

Next: End

OVERHEAT INVESTIGATION

OVERHEAT

Next: End

RESTRICTED / BLOCKED

HEAT EXCHANGER - DHW - 10 PLATES

Next: End

OVERHEATING

HEAT EXCHANGER - PRIMARY

Next: End

CHBOILER5 TO TEMP RADS COLD

VALVE - DHW FLOW

Next: End

DHW

HYDRAULIC OUTLET ASSEMBLY

Next: End

MISCELANEOUS FAULT

PCB

Next: End

EARTH LEAKAGE

GAS VALVE

Next: End

MISCELANEOUS FAULT 2

PCB

Next: End

EARTH LEAKAGE 2

GAS VALVE

Next: End

MISCELANEOUS FAULT 3

PCB

Next: End

EARTH LEAKAGE 3

GAS VALVE

Next: End

MISCELANEOUS FAULT 4

PCB

Next: End

EARTH LEAKAGE 4

GAS VALVE

Next: End

BLOWING FUSE

CABLE - SELECTOR SWITCH / PUMP

Next: End

BLOWING FUSE

CABLE - FAN / PRESSURE SWITCH

Next: End

PCB BLOWING FUSE

PCB FUSE INVESTIGATION

Next: End

DHW PUMP RUNS

Next: End

BLANK FOR FUSE INVESTIGATION

Z BLANK

Next: End

BLANK FOR FUSE INVESTIGATION (APPLIANCE FUSE)

Z BLANK

Next: End

CH IGNITION

EXT CONTOLS / LINK

Next: End

CH IGNITION

PCB

Next: End

NO IGNITION CLOCK OK

PCB

Next: End

NOT RAMPING UP FOR CH

PCB

Next: End

RE-IGNITION DELAY

PCB

Next: End

NOT RE FIRING FOR CH

PCB

Next: End

FAULT CODE 80

PCB

Next: End

OVERHEATING80 DEG OVERHEAT

HEAT EXCHANGER - DHW - 10 PLATES

Next: End

FAULT CODE 80

HEAT EXCHANGER - PRIMARY

Next: End

FAULT CODE 80 NO FAULT OVERHEAT

SENSOR - TEMPERATURE

Next: End

FAULT CODE 60

Z BLANK FOR FUSE INVESTIGATION

Next: End

CUTTING OUT EARLY

THERMOSTAT - LIMIT

Next: End

FAN RUNS 10 SECONDS THEN STOPS

PCB

Next: End

EARTH LEAKAGE 5

GAS VALVE

Next: End

MECHANICAL FAILURE

GAS VALVE

Next: End

MINIMUM SET WRONG ON MODUREG

GAS VALVE

Next: End

OVERHEAT THERMOSTAT

CABLE - TEMP / PRESSURE THERMOSTAT

Next: End

FAN STOPS

THERMOSTAT - OVERHEAT FLUE

Next: End

FAULT CODE OVERHEAT

CABLE - TEMP / PRESSURE THERMOSTAT

Next: End

OVERHEAT FAULT

THERMOSTAT - OVERHEAT FLUE

Next: End

AUTO FROST

PCB

Next: End

DHW OPERATION

HEAT EXCHANGER - DHW - 10 PLATES

Next: End

CH NOISY DHW OK

Next: End

HARNESS - SENSOR FROST

CABLE - TEMP / PRESSURE THERMOSTAT

Next: End

SENSOR - DHW DIES OUT

CABLE - TEMP / PRESSURE THERMOSTAT

Next: End

BOILER TO TEMPERATURE RADIATORS COLD

GAS VALVE

Next: End

BURNER IGNITES BUT BAFFLES OUT

GAS VALVE

Next: End

POOR DHW

PCB

Next: End

DHW OPERATION

HEAT EXCHANGER - PRIMARY

Next: End

CH IGNITION2

EXT CONTOLS / LINK

Next: End

CH IGNITION2

PCB

Next: End

NO IGNITION CLOCK OK2

PCB

Next: End

MAINS LED NOT ILLUMINATED

PCB

Next: End

SELECTOR SWITCH

SWITCH SELECTOR

Next: End

DHW PUMP RUNS

CABLE - PCB INPUT

Next: End

PUMP RUNS NO DEMAND

VALVE - DHW FLOW

Next: End

PUMP RUNS NO DEMAND

SERVICE KIT - DIAPHRAGM - COMBI - DHW

Next: End

PUMP RUNS NO DEMAND

VALVE - DHW FLOW

Next: End

PUMP RUNS NO DEMAND

PCB

Next: End

DHW PUMP RUNS

VALVE - DHW FLOW

Next: End

DHW PUMP RUNS

PUMP

Next: End

SPARK GENERATOR NO SPARK

CABLE - GAS VALVE / IGNITER

Next: End

DHW BURNER IGNITION

ELECTRODE - IGNITION

Next: End

DHW BURNER IGNITION

FAN

Next: End

DHW BURNER IGNITION

VENTURI

Next: End

NO SPARK

SECONDARY HEAT EXCHANGER

Next: End

NO SPARKING

WASHER 58 DIA - FRONT BEND

Next: End

NO SPARKING

CLAMP - BEND - FAN OUTLET

Next: End

MECHANICAL 2

GAS VALVE

Next: End

FAULT 1

CABLE - GAS VALVE / IGNITER

Next: End

FAULT CODE PUMP

PUMP

Next: End

DHW BURNER IGNITION

MANIFOLD -BURNER

Next: End

FAULT CODE OVERHEAT

PCB

Next: End

FAULT CODE FAN

PCB

Next: End

FAULT CODE FAN

FAN

Next: End

FAULT CODE FAN RUNS

VENTURI

Next: End

FAULT CODE FAN

SECONDARY HEAT EXCHANGER

Next: End

FAULT CODE FAN

WASHER 58 DIA - FRONT BEND

Next: End

FAULT CODE FAN

CLAMP - BEND - FAN OUTLET

Next: End

FAN PULSES 3 TIMES

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p1039

FAN PULSES 3 TIMES

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p1053

Fan does not run

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p1060

BURNER IGNITES BUT BURNER PRESSURE EXCESSIVE

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p1705

BURNER IGNITES PRESSURE STARTS TO RAMP UP BUT THEN DROPS OUT AND RE IGNITES

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISHED (HIGH FLAME)

Next: p1249

VENTURI DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1292

CONDENSING HEAT EXCHANGER BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1294

HEAT EXCHANGER SEAL ON ELBOW DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1296

FLUE CLAMP OR SEAL DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p1298

DIAPHRAGM SPLIT OR WORN

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p1368

SPINDLE CORRODED OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p1370

DHW noisy operation

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p352

DIFFERENTIAL VALVE WATERWAYS BLOCKED

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p1372

DHW temperature low, radiators cold

CHARACTERISTIC TEST FROM DHW OPERATION

Next: p705

DIAPHRAGM SPLIT OR WORN

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p1410

DHW temperature low, radiators hot

CHARACTERISTIC TEST FROM DHW OPERATION

Next: !p1470

SPINDLE CORRODED OR SEIZED

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p1412

DIFFERENTIAL VALVE WATERWAYS BLOCKED

CHARACTERISTIC TEST FROM INSPECTION CH DIFFERENTIAL VALVE

Next: !p1414

BOILER CONTINUES TO HEAT PAST 85 DEGREES

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: !p1457

BOILER OVERHEATS BELOW 85 DEGREES

CHARACTERISTIC TEST FROM OBSERVATION RUN BOILER UP TO TEMPERATURE

Next: p1690

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM CH IGNITION

Next: p1528

BURNER IGNITES BUT DOES NOT BEHAVE AS DESCRIBED

CHARACTERISTIC TEST FROM CH IGNITION

Next: p1662

NO RE IGNITION DELAY

CHARACTERISTIC TEST FROM RE-IGNITION DELAY

Next: !p1550

APPLIANCE/SYSTEM COOL, BOILER DOES NOT RE-IGNITE

CHARACTERISTIC TEST FROM RE-IGNITION DELAY

Next: !p1552

BOILER AND RADIATORS ONLY GET WARM

CHARACTERISTIC TEST FROM CH OPERATION

Next: p1141

BOILER UP TO TEMPERATURE RADIATORS COOL

CHARACTERISTIC TEST FROM CH OPERATION

Next: p166

CH noisy, DHW OK

CHARACTERISTIC TEST FROM CH OPERATION

Next: p168

Fires with no demand

CHARACTERISTIC TEST FROM CH OPERATION

Next: p338

Fan does not run

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p1012

FAN PULSES ONCE THEN STOPS

CHARACTERISTIC TEST FROM DHW FAN RUNS

Next: p236

No sparkING PRESENT

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p864

Sparking present, ZERO OR LOW GAS PRESSURE PRESENT

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p893

Sparking, GAS PRESENT BUT NO IGNITION

CHARACTERISTIC TEST FROM DHW BURNER IGNITION

Next: p66

BOILER STILL NOISY

CHARACTERISTIC TEST FROM RE-IGNITION DELAY

Next: p785

BOILER DOES NOT RESPOND TO CH DEMAND

CHARACTERISTIC TEST FROM RE-IGNITION DELAY

Next: p788

MAINS LED FLASHING

CHARACTERISTIC TEST FROM OBSERVATION MAINS LED ILLUMINATED

Next: p1475

MAINS LED NOT ILLUMINATED

CHARACTERISTIC TEST FROM OBSERVATION MAINS LED ILLUMINATED

Next: p807

PUMP PULSES ON AND OFF

CHARACTERISTIC TEST FROM DHW PUMP RUNS

Next: p1483

PUMP DOES NOT RUN

CHARACTERISTIC TEST FROM DHW PUMP RUNS

Next: p822

PUMP RUNS WITH NO DEMAND

CHARACTERISTIC TEST FROM DHW PUMP RUNS

Next: p824

DIAPHAGM WORN AND / OR DAMAGED

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p829

DIFFERENTIAL VALVE - STUFFING BOX LEAKING

CHARACTERISTIC TEST FROM INSPECTION DIFFERENTIAL VALVE DHW

Next: !p831

VENTURI DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p886

CONDENSING HEAT EXCHANGER BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p888

HEAT EXCHANGER SEAL ON ELBOW DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p890

FLUE CLAMP OR SEAL DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p892

PRESSURE LOW OR DIES OUT

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISHED (HIGH FLAME)

Next: p1647

Burner ignites but baffles out

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISHED (HIGH FLAME)

Next: p694

BURNER IGNITES, SPARK CONTINUES, BOILER GOES TO LOCKOUT

CHARACTERISTIC TEST FROM DHW BURNER ESTABLISHED (HIGH FLAME)

Next: p1341

VENTURI DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p988

CONDENSING HEAT EXCHANGER BLOCKED OR RESTRICTED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p990

HEAT EXCHANGER SEAL ON ELBOW DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p992

FLUE CLAMP OR SEAL DAMAGED

CHARACTERISTIC TEST FROM INSPECTION FLUE COMPONENTS

Next: !p994

02/08/2021 13:03:47 2107_1_50_1 31/08/2021 11:22:57

03/08/2021 10:09:50

Next: End

RESISTANCE APS AT APS

DISCONNECT THE LEADS FROM THE AIR PRESSURE SWITCH

Next: !p1041, f1042

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE INNER COMBUSTION COVER TO GAIN ACCESS TO THE FAN AREA.

Next: p1043, !f1044

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE INNER COMBUSTION COVER TO GAIN ACCESS TO THE FAN AREA.

Next: p1056, !f1057

FAN VOLTAGE AT PCB

{GAINPCBACS}
SELE

Next: !p1063, !f1064

RESISTANCE APS AT APS

DISCONNECT THE LEADS FROM THE AIR PRESSURE SWITCH

Next: !p1072, f1055

RESISTANCE SENSOR CH AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR M2 FROM THE PCB

Next: p1553, f1077

RESISTANCE SENSOR CH

REMOVE CONNECTOR FROM THE TEMPERATURE SENSOR

Next: !p1078, !f1079

RESISTANCE GAS VALVE

DISCONNECT CONNECTOR PLUG FROM GAS VALVE

Next: !p1139, !f1140

FAN VOLTAGE AT PCB

{GAINPCBACS}
SELE

Next: !p1203, f1356

PUMP PROVING SWITCH SPINDLE

SELECTOR SWITCH IN D

Next: p1387, f1358

CHECK FOR TRAPPED AIR AND SYSTEM WATER PRESSURE

ENSURE THE PUMP IS NOT RUNNING AS THIS MAY ALTER THE PRESSURE SHOWN.

Next: p1359, !f1360

RESISTANCE SENSOR CH

REMOVE CONNECTOR FROM THE TEMPERATURE SENSOR

Next: !p1381, !f1382

CHECK FOR TRAPPED AIR AND SYSTEM WATER PRESSURE

ENSURE THE PUMP IS NOT RUNNING AS THIS MAY ALTER THE PRESSURE SHOWN.

Next: p1401, !f1402

WATER SUPPLY TO PREMISES

TURN ON A COLD WATER TAP

Next: p1432, !f1439

TEMPERATURE DIFFERENTIAL CH

ATTACH FGA TEMPERATU

Next: !p1441, f1442

INSPECTION RECUPERATOR HEAT EXCHANGER WATER WAYS

PRIMARY WATER CIRCUIT DRAINED AND DISCHARGED
REMOVE THE FLOW AND RETURN PIPES TO THE RECUPERATOR

Next: !p1443, !f1444

TEMPERATURE DIFFERENTIAL CH

ATTACH FGA TEMPERATU

Next: !p1462, f1463

INSPECTION RECUPERATOR HEAT EXCHANGER WATER WAYS

PRIMARY WATER CIRCUIT DRAINED AND DISCHARGED
REMOVE THE FLOW AND RETURN PIPES TO THE RECUPERATOR

Next: !p1464, !f1465

INSPECTION 3-WAY VALVE OPERATION

DISCHARGE AND DRAIN THE HOT WATER CIRCUIT

Next: !p1467, !f1468

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1481, !f1482

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1486, !f1487

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1491, !f1492

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1496, !f1497

RESISTANCE PUMP AND HARNESS FUSE INVESTIGATION

REMOVE CONNECTOR M1 FROM THE PCB

Next: p1501, f1500

RESISTANCE PUMP FUSE INVESTIGATION

REMOVE THE COVER FROM THE PUMP ASSEMBLY
REMOVE THE WIRES FROM THE PUMP ASSEMBLY

Next: !p1502, !f1503

RESISTANCE FAN FUSE INVESTIGATION

DISCONNECT LIVE AND NEUTRAL LEADS FROM FAN

Next: !p1506, !f1507

RESISTANCE FUSE MAINS

GAIN ACCESS TO THE MAINS FUSE FOR THE APPLIANCE

Next: !p1517, f1518

FUSE FURTHER INVESTIGATION (MAINS)

Next: !p1519, !f1520

FUSE FURTHER INVESTIGATION (APPLIANCE)

Next: !p1522, !f1523

ROOM THERMOSTAT / EXTERNAL TIMER INPUT

{GAINPCBACS}
SELE

Next: !p1531, !f1532

TIMER LINK IN VOLTS INPUT

{GAINPCBACS}
SELE

Next: p1535, !f1536

SELECTOR SWITCH (LOCKOUT/RESET)

REMOVE RED AND BLUE

Next: !p1556, !f1557

TEMPERATURE DIFFERENTIAL CH

ATTACH FGA TEMPERATU

Next: !p1623, f1624

INSPECTION RECUPERATOR HEAT EXCHANGER WATER WAYS

PRIMARY WATER CIRCUIT DRAINED AND DISCHARGED
REMOVE THE FLOW AND RETURN PIPES TO THE RECUPERATOR

Next: !p1625, !f1626

EARTH LEAKAGE CHECK GAS VALVE DISCONNECTED

REMOVE THE CONNECTOR FROM THE GAS VALVE

Next: !p1700, !f1701

RESET FLUE THERMOSTAT

Next: !p1721, !f1722

RESET FLUE THERMOSTAT

Next: !p1727, !f1728

OVERHEAT THERMOSTAT RESISTANCE

REMOVE TWO CONNECTORS FROM OVERHEAT THERMOSTAT

Next: p1671, !f579

RESISTANCE SENSOR CH

REMOVE CONNECTOR FROM THE TEMPERATURE SENSOR

Next: !p587, !f588

RESISTANCE SENSOR CH

REMOVE CONNECTOR FROM THE TEMPERATURE SENSOR

Next: !p597, !f596

FAN RUNNING

SELECTOR SWITCH TO D

Next: p1314, ?1049, ?1051

RESISTANCE SENSOR CH AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR M2 FROM THE PCB

Next: p656, !f657

ROOM THERMOSTAT / EXTERNAL TIMER INPUT

{GAINPCBACS}
SELE

Next: !p791, !f792

TIMER LINK IN VOLTS INPUT

{GAINPCBACS}
SELE

Next: p795, !f796

MAINS POWER SUPPLY

{GAINPCBACS}

Next: p810, f1516

FUSE (2 AMP) RESISTANCE

REMOVE FUSE FROM FUSE HOLDER LOCATED IN THE MAIN TERMINAL BLOCK

Next: !p814, f1521

INSPECTION DIFFERENTIAL VALVE DHW

ISOLATE DHW COLD FEE

Next: !p827, ?828, ?830

DHW DIAPHRAGM

BOILER DRAINED AND DISCHARGED

Next: p838, !f839

DHW DEMAND MICROSWITCH OPERATION

REMOVE THE M1 CONNECTOR FROM THE PCB.

Next: p846, !f847

RESISTANCE HARNESS APS

{GAINPCBACS}
DISC

Next: p869, !f870

VOLTAGE SPARK GENERATOR (INPUT)

{GAINPCBACS}
SELE

Next: p873, !f874

VOLTAGE GAS VALVE AT PCB

{GAINPCBACS}
SELE

Next: !p898, f1138

RESISTANCE SENSOR CH AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR M2 FROM THE PCB

Next: !p1009, !f908

RESISTANCE SENSOR CH AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR M2 FROM THE PCB

Next: !p1008, !f911

DHW PUMP RUNS (FAULT CODE)

SELECTOR SWITCH TO DHW POSITION
DHW TEMPERATURE SELECTOR TO MAXIMUM

Next: p1398, f915

PUMP VOLTS

{GAINPCBACS}
SELE

Next: !p916, !f917

OBSERVATION BOILER RESET

ENSURE APPLIANCE IS COOL
DHW TEMPERATURE SELECTOR TO MAX

Next: p1094, f962

OVERHEAT AND FLUE THERMOSTAT HARNESS RESISTANCE

LOCATE AND REMOVE CONNECTOR M2 FROM THE PCB.

Next: !p963, f964

OVERHEAT THERMOSTAT RESISTANCE

REMOVE TWO CONNECTORS FROM OVERHEAT THERMOSTAT

Next: p1681, !f966

RESISTANCE HARNESS APS

{GAINPCBACS}
DISC

Next: !p979, !f980

FLAME SENSE POSITION

Next: p310, !f581

FAN VOLTS

SELECTOR SWITCH TO O

Next: !p1013, f1202

AIR PRESSURE SWITCH RESISTANCE

{GAINPCBACS}
LOCATE AND REMOVE M5 CONNECTOR FROM THE PCB

Next: !p1047, f1040

VENTURI

REMOVE THE FAN ASSEMBLY FROM THE BOILER

Next: !p1045, !f1046

AIR PRESSURE SWITCH RESISTANCE

{GAINPCBACS}
LOCATE AND REMOVE M5 CONNECTOR FROM THE PCB

Next: !p1054, f1065

VENTURI

REMOVE THE FAN ASSEMBLY FROM THE BOILER

Next: !p1058, !f1059

FAN VOLTS

SELECTOR SWITCH TO O

Next: !p1061, f1062

DHW DEMAND MICROSWITCH OPERATION

REMOVE THE M1 CONNECTOR FROM THE PCB.

Next: p1155, !f1086

RESISTANCE MODULATING SOLENOID

REMOVE THE BLACK LEADS FROM THE MODULATING SOLENOID

Next: p226, !f1093

INSPECTION PRESSURE SYSTEM

Next: p1182, !f1096

PUMP LIMPET

Next: p1107, !f1098

RESISTANCE SENSOR CH AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR M2 FROM THE PCB

Next: p1445, !f1109

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p653, !f1151

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1153, !f1154

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p175, !f1161

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1164, !f1165

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p1095, !f1198

PRIMARY HEAT EXCHANGER FLUE WAYS

Next: p879, !f1247

VOLTAGE FAN AT PCB AIR FLOW

{GAINPCBACS}
SELE

Next: p1251, !f1250

RESISTANCE AIR PRESSURE SWITCH WITH KIT

DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS

Next: p1282, !f1253

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE INNER COMBUSTION COVER TO GAIN ACCESS TO THE FAN AREA.

Next: p1283, !f1284

PRIMARY HEAT EXCHANGER FLUE WAYS

Next: p1285, !f1286

INSPECTION FLUE

Next: p1287, !f1288

INSPECTION FLUE SEAL AND COMPONENTS

REMOVE THE TWO FLUE CLAMPS AND THE CONDENSING HEAT EXCHANGER ELBOW

Next: !p1289, ?1291, ?1293, ?1295, ?1297

PRIMARY HEAT EXCHANGER FLUE WAYS

Next: p981, !f1313

VOLTAGE FAN AT PCB AIR FLOW

{GAINPCBACS}
SELE

Next: p974, !f1338

OBSERVATION RECTIFICATION TRAP DISCONNECTED

REMOVE THE WHITE WIRE FROM THE CONDENSATE TRAP ASSEMBLY AND MAKE SAFE

Next: p99, !f1348

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p1361, !f1362

PUMP LIMPET

Next: p1363, !f1364

INSPECTION CH DIFFERENTIAL VALVE

APPLIANCE DRAINED AND DISCHARGED

Next: p1365, ?1367, ?1369, ?1371

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: p1373, !f1374

INTERNAL-BYPASS CHECK

BOILER DRAINED AND DISCHARGED

Next: !p1375, !f1376

RESISTANCE SENSOR CH AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR M2 FROM THE PCB

Next: p1379, f1380

SELECTOR SWITCH (LOCKOUT/RESET)

REMOVE RED AND BLUE

Next: p1493, !f1384

CH DEMAND MICROSWITCH OPERATION

REMOVE THE RED LEADS

Next: p1729, !f1397

PUMP PROVING SWITCH SPINDLE

SELECTOR SWITCH IN D

Next: p1419, f1400

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p1403, !f1404

PUMP LIMPET

Next: p1405, !f1406

INSPECTION CH DIFFERENTIAL VALVE

APPLIANCE DRAINED AND DISCHARGED

Next: p1407, ?1409, ?1411, ?1413

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: p1415, !f1416

INTERNAL-BYPASS CHECK

BOILER DRAINED AND DISCHARGED

Next: !p1417, !f1418

CH DEMAND MICROSWITCH OPERATION

REMOVE THE RED LEADS

Next: p1742, !f1420

INSPECTION DHW INLET VALVE

Next: p1433, !f1434

DHW INLET FILTER

DHW CIRCUIT OF APPLIANCE DRAINED AND DISCHARGED

Next: p1435, !f1436

DHW FLOW RESTRICTOR/FILTER

BOILER DRAINED AND DISCHARGED

Next: !p1437, !f1438

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: p1446, f1461

PRESSURE BURNER MAXIMUM AND MINIMUM

ATTACH PRESSURE GAUG

Next: p1448, !f1447

OBSERVATION RUN BOILER UP TO TEMPERATURE

CH TEMPERATURE SELEC

Next: p1452, ?1456, ?1458

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1460, !f1453

RESISTANCE FAN

DISCONNECT LIVE AND NEUTRAL LEADS FROM THE FAN

Next: p1478, !f1477

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1479, f1480

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1484, f1485

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1489, f1490

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1494, f1495

RESISTANCE FAN AND HARNESS FUSE INVESTIGATION

REMOVE CONNECTOR M5 FROM THE PCB

Next: p1504, f1505

RESISTANCE GAS VALVE FUSE INVESTIGATION

DISCONNECT CONNECTOR PLUG FROM GAS VALVE

Next: p1508, !f1509

DIODE TEST GAS VALVE HARNESS FUSE INVESTIGATION

REMOVE THE CONNECTOR

Next: p1510, !f1511

RESISTANCE GAS VALVE HARNESS FUSE INVESTIGATION

REMOVE CONNECTOR M4 FROM THE PCB

Next: !p1512, !f1513

RESISTANCE SENSOR CH

REMOVE CONNECTOR FROM THE TEMPERATURE SENSOR

Next: p1543, !f1545

EXTERNAL CONTROLS/RTC OUTPUT

{GAINPCBACS}
SELE

Next: p1529, f1530

CLOCK FITTED

Next: p1533, f1534

CLOCK IN VOLTS INPUT

{GAINPCBACS}
SELE

Next: p1539, !f1540

TIMER LINK RESISTANCE

DISCONNECT CONNECTOR M3 FROM THE PCB

Next: !p1537, !f1538

CLOCK RESISTANCE

DISCONNECT CONNECTOR M3 FROM THE PCB

Next: !p1541, !f1542

INSPECTION PCB CONTROL KNOBS

{GAINPCBACS}

Next: !p1544, !f1546

OBSERVATION BOILER RESET (CH SENSOR)

DHW TEMPERATURE SELECTOR TO MAX

Next: p1554, f1555

INSPECTION PRESSURE SYSTEM

Next: p1558, !f1559

INSPECTION ISOLATION VALVES FLOW AND RETURN

Next: p1618, !f1561

PUMP LIMPET

Next: p1619, !f1620

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: p1621, f1622

PRESSURE BURNER MAXIMUM AND MINIMUM

ATTACH PRESSURE GAUG

Next: p1627, !f1628

INSPECTION FILTER RETURN

APPLIANCE PRIMARY WA

Next: !p1629, !f1630

OBSERVATION BOILER OPERATION (PUMP FAULT)

DHW TEMPERATURE SELECTOR TO MAX

Next: !p1632, !f1633

INSPECTION COMPENSATION PIPE

Next: p95, !f1646

GAS INLET PRESSURE

ATTACH U-GAUGE TO GA

Next: p1634, !f1661

DHW SPINDLE

Next: p1080, f1466

INSPECTION COMPENSATION PIPE

Next: p1527, !f1668

FLUE THERMOSTAT RESISTANCE

REMOVE ONE CONNECTOR FROM FLUE THERMOSTAT

Next: !p1717, f1720

PUMP LIMPET TEST

Next: p187, !f188

FLUE THERMOSTAT RESISTANCE

REMOVE ONE CONNECTOR FROM FLUE THERMOSTAT

Next: !p1725, f1726

FLUE THERMOSTAT RESISTANCE - OPERATION

REMOVE ONE CONNECTOR FROM FLUE THERMOSTAT

Next: !p1691, !f1692

EARTH LEAKAGE CHECK GAS VALVE AND HARNESS

Next: !p1699, f1695

INSPECTION COMPENSATION PIPE

Next: !p1706, !f1707

INSPECTION COMPENSATION PIPE

Next: p894, !f1716

RESISTANCE HARNESS PUMP PROVING SWITCH

REMOVE CONNECTOR M2 FROM THE PCB
REMOVE THE 2 WIRES FROM THE LOW PRESSURE SWITCH

Next: p1378, !f1741

RESISTANCE HARNESS PUMP PROVING SWITCH

REMOVE CONNECTOR M2 FROM THE PCB
REMOVE THE 2 WIRES FROM THE LOW PRESSURE SWITCH

Next: p1631, !f1746

PUMP LIMPET TEST

Next: p1163, !f197

INTERNAL-BYPASS CHECK

BOILER DRAINED AND DISCHARGED

Next: !p414, !f190

MODULATING SOLENOID VOLTAGE

SELECTOR SWITCH TO D

Next: !p1704, !f228

OVERHEAT AND FLUE THERMOSTAT HARNESS RESISTANCE

LOCATE AND REMOVE CONNECTOR M2 FROM THE PCB.

Next: p1693, f576

FLAME SENSE LEAD

Next: !p1349, !f582

RESISTANCE SENSOR CH AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR M2 FROM THE PCB

Next: !p339, f586

CH OPERATION

SELECTOR SWITCH TO D

Next: !p353, ?781, ?783

GAS RATE

Next: p654, f655

PUMP LIMPET TEST

Next: p1152, !f663

MODULATING SOLENOID VOLTAGE

SELECTOR SWITCH TO D

Next: !p658, !f659

SPARK ELECTRODE GAP

Next: !p92, !f93

GAS INLET PRESSURE

ATTACH U-GAUGE TO GA

Next: p695, !f696

CONDENSATE TRAP CLEAR

REMOVE THE CONDENSATE TRAP

Next: p697, !f698

PRIMARY HEAT EXCHANGER FLUE WAYS

Next: p699, !f700

INSPECTION CONDENSING HEAT EXCHANGER

Next: p701, !f702

INSPECTION FLUE

Next: !p703, !f704

TEMPERATURE DIFFERENTIAL DHW

ATTACH TEMPERATURE P

Next: p706, f1440

RESISTANCE SENSOR CH AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR M2 FROM THE PCB

Next: p708, !f709

INSPECTION PCB CONTROL KNOBS

{GAINPCBACS}

Next: p710, !f711

INSPECTION BURNER MANIFOLD

REMOVE THE BURNER ASSEMBLY

Next: !p712, !f713

INTERNAL-BYPASS CHECK

BOILER DRAINED AND DISCHARGED

Next: !p786, !f787

EXTERNAL CONTROLS/RTC OUTPUT

{GAINPCBACS}
SELE

Next: p789, f790

CLOCK FITTED

Next: p793, f794

CLOCK IN VOLTS INPUT

{GAINPCBACS}
SELE

Next: p799, !f800

TIMER LINK RESISTANCE

DISCONNECT CONNECTOR M3 FROM THE PCB

Next: !p797, !f798

CLOCK RESISTANCE

DISCONNECT CONNECTOR M3 FROM THE PCB

Next: !p801, !f802

POWER TO CONTROL BOARD

{GAINPCBACS}
SELECTOR SWITCH TO DHW POSITION

Next: !p808, f809

SELECTOR SWITCH VOLTAGE

SELECTOR SWITCH TO OFF POSITION

Next: !p812, f813

DHW DEMAND

HOT TAP TURNED OFF

Next: p836, f837

OPERATION DIFFERENTIAL VALVE DHW

Next: p825, f826

RESISTANCE DHW MICROSWITCH AND HARNESS

REMOVE THE M1 CONNECTOR FROM THE PCB.
DHW TAPS OFF

Next: !p832, !f833

PUMP VOLTS

{GAINPCBACS}
SELE

Next: !p844, f845

DHW SENSING PIPES

BOILER DRAINED AND DISCHARGED

Next: p840, !f841

WATER INLET VENTURI

BOILER DRAINED AND DISCHARGED

Next: !p842, !f843

SELECTOR SWITCH (LOCKOUT/RESET)

REMOVE RED AND BLUE

Next: p1488, !f849

RESISTANCE AIR PRESSURE SWITCH WITH KIT

DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS

Next: p865, !f866

OBSERVATION SPARKING WITH APS PROVEN

DISCONNECT THE RIGHT HAND TUBE(+VE) FROM THE VENTURI AND CONNECT THE AIR PRESSURE SWITCH CHARGE KIT

Next: p867, f868

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE INNER COMBUSTION COVER TO GAIN ACCESS TO THE FAN AREA.

Next: p1233, !f880

SPARK GENERATOR (OUTPUT)

REMOVE THE LEAD FROM

Next: p871, f872

SPARK ELECTRODE GAP

Next: !p877, !f878

RESISTANCE ELECTRODE LEAD

REMOVE THE ELECTRODE LEAD

Next: !p875, !f876

INSPECTION FLUE

Next: p881, !f882

INSPECTION FLUE SEAL AND COMPONENTS

REMOVE THE TWO FLUE CLAMPS AND THE CONDENSING HEAT EXCHANGER ELBOW

Next: !p883, ?885, ?887, ?889, ?891

GAS INLET PRESSURE

ATTACH U-GAUGE TO GA

Next: p1708, !f895

VOLTAGE GAS VALVE AT GAS VALVE

{GAINPCBACS}
SELE

Next: !p896, f897

RESISTANCE SENSOR CH AND HARNESS

{GAINPCBACS}
REMOVE CONNECTOR M2 FROM THE PCB

Next: p1087, f595

RESISTANCE AIR PRESSURE SWITCH WITH KIT

DISCONNECT LEADS FROM THE AIR PRESSURE SWITCH NOTING THE CONNECTIONS

Next: p975, !f976

OBSERVATION SPARKING WITH APS PROVEN

DISCONNECT THE RIGHT HAND TUBE(+VE) FROM THE VENTURI AND CONNECT THE AIR PRESSURE SWITCH CHARGE KIT

Next: p977, f978

INSPECTION AIR PRESSURE SWITCH TUBES

REMOVE INNER COMBUSTION COVER TO GAIN ACCESS TO THE FAN AREA.

Next: p1299, !f982

INSPECTION FLUE

Next: p983, !f984

INSPECTION FLUE SEAL AND COMPONENTS

REMOVE THE TWO FLUE CLAMPS AND THE CONDENSING HEAT EXCHANGER ELBOW

Next: !p985, ?987, ?989, ?991, ?993

FLAME SENSE ELECTRODE

Next: p100, !f101

System Information

Total Tests: 533

Sequence Logic: Decoded from encrypted .seq file

Navigation: Dynamic based on pass/fail results

Source: 4731307 GW SWIFTFLOW 100 SIT Control